I think the issue in 4v4 is that people can spam caches which makes getting the resources for the most expensive stuff which is usually axis much easier to get allowing its timing to be a lot faster than it should be. I almost think caches should be limited to like 1 per player. People in 1v1/2v2 don't often build more than 1 cache anyway.
I think because of Ost can give resources to Okw make Okw sometimes tank come much earlier. Especially 3v3 4v4. I had a game where Okw got King at 12min.
Put cache cost down to 150mp. But only give the player who built it resources.